*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}

body{
    min-height:100vh;
    overflow-x:hidden;
    overflow-y:auto;
    background:linear-gradient(135deg,#0f2027,#203a43,#2c5364,#4facfe);
    color:white;
    text-align:center;
    position:relative;
}

.formula{
            position:absolute;
            color:rgba(255,255,255,0.18);
            font-size:40px;
            font-weight:bold;
            animation:flotar linear infinite;
            user-select:none;
}

@keyframes flotar {
    0%{
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    20%{
        opacity: 1;
    }
    100%{
        transform: translateY(-120vh) rotate(360deg);
        opacity: 0;
    }
    
}

.contenido{
    position: relative;
    z-index: 10;
    padding-top: 60px;
}

h1{
    font-size: 45px;
    margin-bottom: 20px;
    text-shadow: 0 0 20px cyan;
}
h3{
    width: 70%;
    margin: auto;
    margin-bottom: 50px;
    line-height: 1.6;
}

.contenedor{
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
}

.contenedor img{
    width: 180px;
    height: 250px;
    object-fit: cover;
    border-radius: 20px;
    transition:.4s;
    box-shadow:0 10px 30px rgba(0,0,0,.4);
}


.contenedor img:hover{
    transform:translateY(-25px) scale(1.08);
    box-shadow:0 25px 40px rgba(255,255,255,.4);
}

.boton-contenedor{
    margin-top:120px; /* lo baja bastante */
}

.btn{
    display:inline-block;
    padding:15px 35px;
    background:linear-gradient(45deg,#00c6ff,#0072ff);
    color:white;
    text-decoration:none;
    font-size:20px;
    font-weight:bold;
    border-radius:40px;
    box-shadow:0 10px 25px rgba(0,0,0,.3);
    transition:.3s;
}

.btn:hover{
    transform:translateY(-5px) scale(1.05);
    box-shadow:0 15px 30px rgba(255,255,255,.4);
}

@media (max-width:768px){

    .contenido{
        padding-top:30px;
    }

    h1{
        font-size:30px;
        margin-bottom:15px;
    }

    h3{
        width:95%;
        font-size:15px;
        margin-bottom:30px;
    }

    .contenedor{
        gap:15px;
    }

    .contenedor img{
        width:140px;
        height:190px;
    }

    .boton-contenedor{
        margin-top:50px;
        margin-bottom:30px;
    }

    .btn{
        width:90%;
        max-width:250px;
        font-size:18px;
    }

    .formula{
        font-size:25px;
    }
}